Them: Can you do this?
Me: Yes, but not for at least a few months.
Them: OK.

Them (2 weeks later): Any update on when you're gonna do this?
Me: In at least a few months.

Them: Really want to align on getting this done in the next few weeks.
Me: Well that is a shame because it will take at least a few months.

[Boundaries: I am having them!]